any suggestions on how i can get my server bigger and make more people join?

Make sure not to have like 100 things you can buy with real money, have only donator and vip and it should unlock only a few jobs that are upgrades to free jobs.
Just make sure you don't have any cancerous SUPER EXTRA MEGA UBER VIP (NOSCOPER JOB 1 HIT KILL 9999999 RPM WEAPON AND CAN RDM)